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There are two different ways to determine the age of rocks and fossils: Relative Dating, and Absolute Dating.

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Most fossils and rocks are dated using relative dating.  Relative dating involves comparing a fossil to the ones around it that have been dated already or comparing it to similar fossils.

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Absolute Dating involves the use of radiometric dating techniques. Radiometric dating employs the use of radioactive materials in the minerals. The proportion of parent isotopes to broken down isotopes helps scientists know how long the minerals have been breaking down and, therefore, how old the rocks and fossils are.

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https://dsx.weather.com/util/image/w/en-in-fossil.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0

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https://www.nist.gov/sites/default/files/styles/480_x_480_limit/public/images/mml/csd/sh_32484541_fossil_zoltan_pataki_lr.jpg?itok=58Z9uSpC

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https://www.fossilera.com/pages/dating-fossils
https://www.nature.com/scitable/knowledge/library/dating-rocks-and-fossils-using-geologic-methods-107924044